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A method and device for determining seawater depth

A technology of seawater depth and seawater, which is applied in the direction of measuring devices, seismology for areas covered by water, and reradiation of sound waves. It can solve the problems of seawater depth errors and the inability to effectively eliminate the interference of multiple waves Strong anti-noise ability, eliminate the effect of seawater multiple wave interference, and improve the effect of signal-to-noise ratio and resolution

Active Publication Date: 2018-08-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is a large error in the sea depth determined by the cross-correlation function containing noise
Therefore, using the seawater depth calculation method in the prior art, it is impossible to effectively eliminate the influence of multiple wave interference caused by seawater ringing in the seismic data of hydrophones

Method used

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  • A method and device for determining seawater depth
  • A method and device for determining seawater depth
  • A method and device for determining seawater depth

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Embodiment Construction

[0039] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0040] The specific implementation of the embodiment of the present application will be described in detail below with several specific examples.

[0041] In practical application, the seismic data of the hydrophone and the seismic data of the land geophone can be collected and obtained from the hydrophone and the land geophone after bein...

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Abstract

An embodiment of the invention provides a method and device for determining depth of seawater. The method includes the steps: obtaining segment water demodulation data and segment land demodulation data through segment processing of seismic data of an underwater detector and seismic data of a land detector, and calculating to obtain up-going wave field data and down-going wave field data according to the segment water demodulation data and segment land demodulation data which are obtained by segment processing of the seismic data of the underwater detector and the seismic data of the land detector; and then, based on frequency domain up-going wave field data and frequency domain down-going wave field data after segmentation, using a cross bispectrum method to determine the depth of seawater. Using the technical scheme provided by the embodiment of the invention can obtain high-precision depth of seawater, thereby effectively eliminating influence of seawater singing multiple interference in the seismic data, and improving the signal to noise ratio and resolution ratio of the seismic data.

Description

technical field [0001] The invention relates to the technical field of offshore oil and gas exploration, in particular to a method and device for determining seawater depth. Background technique [0002] OBC (Ocean Bottom Cable) is a combined offshore and land seismic data acquisition technology, which fixes the geophone on the seabed to obtain high-resolution 3D seismic data. During OBC data acquisition, the initial reflected seismic wavelet reaches the seabed from underground, and the geophone in the submarine cable senses and records the initial reflected seismic wavelet. Since both the sea bottom and the sea surface are strong reflection interfaces, the initial reflection wavelet continues to advance upwards to reach the sea surface, is reflected by the sea surface, and then changes direction and propagates downward to reach the sea bottom. The geophones in the submarine cable again sense and record the secondary reflected seismic wavelet. At the same time, the seconda...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36G01V1/30G01S15/08
CPCG01S15/08G01V1/30G01V1/36G01V1/38G01V2210/32
Inventor 高少武赵波钱忠平王成祥李桂芳
Owner BC P INC CHINA NAT PETROLEUM CORP
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